Ethernet (ETH): media access control (MAC) with DMA controller RM0008
981/1128 DocID13902 Rev 15
Figure 340. Transmission with collision
Figure 341 shows a frame transmission in MII and RMII.
Figure 341. Frame transmission in MMI and RMII modes
29.5.3 MAC frame reception
The MAC received frames are pushes into the Rx FIFO. The status (fill level) of this FIFO is
indicated to the DMA once it crosses the configured receive threshold (RTC in the
ETH_DMAOMR register) so that the DMA can initiate pre-configured burst transfers
towards the AHB interface.
In the default Cut-through mode, when 64 bytes (configured with the RTC bits in the
ETH_DMAOMR register) or a full packet of data are received into the FIFO, the data are
popped out and the DMA is notified of its availability. Once the DMA has initiated the
transfer to the AHB interface, the data transfer continues from the FIFO until a complete
MII_TX_CLK
MII_TX_EN
MII _TXD[ 3:0]
PR EAM BLE SFD
MII_CS
MII_COL
ai15651
DA DA JAM JAM JAM JAM
MII_RX_CLK
MII_TX_EN
MII_TXD[3:0]
RMII_REF_CLK
RMII_TXD[1:0]
RMII_TX_EN
ai15652
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